Raymarine ST70 Instrument User Reference Handbook - 4.4 Wind Setup
4.4 Wind setup
Calibrating wind speed
• You will need to be underway, with sufficient space to turn in a
large slow circle unhindered.
• Conditions should be calm or slight water and a steady breeze.
With the list of transducers available displayed from the Transducer
Setupmenu.
1. Press ENTER to proceed to the transducer setup options.
2. Select Wind then Calibrate Vane from the available options.
3. Press ENTER and follow the on-screen instructions to complete
the calibration.
Aligning the wind vane
Aligning the wind vane ensures that the wind angle reading is
accurate.
• You will need to be underway, with sufficient space to maneuver
unhindered.
• Conditions should be calm or slight water and a steady breeze.
Head directly into the wind, then follow the instructions below.
With the list of transducers available displayed from the Transducer
Setupmenu:
1. Press ENTER to proceed to the transducer setup options.
2. Select Wind then Align Vane from the available options.
3. Check that you are still heading directly into the wind, then
press ENTER to accept the alignment and return to the Wind
transducer setup menu.
4.5 Speed calibration
Speed calibration involves aligning the log speed (Speed Through
Water) to the Speed over ground (SOG), under zero tide conditions.
The object of speed calibration is to ensure that the speed readings
at the instruments are true indications of the boat speed.
Speed transducer performance is affected by its position and
water-flow characteristics at different speeds. It is advisable to carry
out calibration at various speeds across the range of your boat.
Calibrating speed (conventional transducers)
• You will need an accurate speed over ground (SOG) value, e.g.
determined from a GPS connected into your SeaTalk system.
• You will need to be underway, with sufficient space to maneuver
unhindered.
• Conditions should be calm water with a slack tide.
Note: It is important that there is no tide. The affect of tidal
current would be to prevent an accurate speed calibration.
With the list of transducers available displayed from the Transducer
Setup menu:
1. Press ENTER to proceed to the transducer setup options.
2. Select Speed then Calibration from the available options.
3. Calibrate each speed as follows, starting with the lowest:
22
ST70 Instrument User reference